Linux： sd 0:0:1:0: timing out command, waited 1080s，访问磁盘错误

这个错误的原因是，存储设备的问题，导致scsi的请求超时。需要查看硬件状态。

kernel: [918457.120743] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 2 4 5 6} (detected by 0, t=197988 jiffies, g=15660653, c=15660652, q=2)
kernel: [918457.137621] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 2 4 5 6} (detected by 7, t=2397028 jiffies, g=15660653, c=15660652, q=2)
[    2.023330] sd 0:0:1:0: [sdb] 44040192 512-byte logical blocks: (22.5 GB/21.0 GiB)
Aug 04 00:08:36 localhost kernel: sd 0:0:1:0: [sdb] Write Protect is off
Aug 04 00:08:36 localhost kernel: sd 0:0:1:0: [sdb] Mode Sense: 61 00 00 00
Aug 04 00:08:36 localhost kernel: sd 0:0:1:0: [sdb] Cache data unavailable
Aug 04 00:08:36 localhost kernel: sd 0:0:1:0: [sdb] Assuming drive cache: write through
Aug 04 00:08:36 localhost kernel: sd 0:0:1:0: [sdb] Attached SCSI disk
Aug 04 00:08:37 localhost systemd-fsck[341]: /dev/sdb1: clean, 39089/393216 files, 494795/1572608 blockskernel: [918457.370064] sd 0:0:1:0: timing out command, waited 1080s
kernel: [918457.371410] sd 0:0:1:0: [sdb] FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK
kernel: [918457.373104] sd 0:0:1:0: [sdb] CDB: Write(10) 2a 00 01 04 8d a0 00 00 20 00
2a 代表 write_10
00 代表 TEST_UNIT_READY   fua:   ///flags   force unit access
01 04 8d a0,  lba   /// == 10进制-17075616   ///logic block address
00
00 20, count    bytes countself.gutenberg.org/articles/scsi_read_commandsvoid scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,int disposition)
{///drivers/scsi/scsi_lib.c
static void scsi_softirq_done(struct request *rq)
{struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);unsigned long wait_for = (cmd->allowed + 1) * rq->timeout;int disposition;INIT_LIST_HEAD(&cmd->eh_entry);atomic_inc(&cmd->device->iodone_cnt);if (cmd->result)atomic_inc(&cmd->device->ioerr_cnt);disposition = scsi_decide_disposition(cmd);if (disposition != SUCCESS &&time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) {sdev_printk(KERN_ERR, cmd->device,"timing out command, waited %lus\n",  wait_for/HZ);disposition = SUCCESS;}

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Linux： sd 0:0:1:0: timing out command, waited 1080s，访问磁盘错误

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Linux： sd 0:0:1:0: timing out command, waited 1080s，访问磁盘错误

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